Protection circuit and battery

Abstract

The utility model relates to the technical field of active humidity protection of a battery management system, and discloses a protection circuit and a battery, the protection circuit is arranged in the battery, the protection circuit comprises a temperature and humidity sensor, an acquisition unit and a control unit, the output end is connected with the first input end of the acquisition unit; the second input end of the acquisition unit is connected with the cell of the battery, the communication end of the acquisition unit is connected with the communication end of the control unit, and the control end of the acquisition unit is connected with the output end of the control unit; the output end of the control unit serves as the output end of the battery. Active protection can be carried out according to the humidity condition in the battery, potential safety hazards caused by the fact that the humidity in the battery is too high and insulation is reduced are avoided, meanwhile, the effectiveness of humidity data can be judged, battery humidity protection action false triggering is prevented, and protection reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of active humidity protection of a battery management system, in particular to a protection circuit and a battery. Background Art

[0002] Household energy storage batteries are not only used indoors, but also outdoors in carports or balconies. The application scenarios are worse than those indoors, and are likely to encounter extreme weather such as heavy rain. In addition, the continuous aging of batteries outdoors may lead to a decrease in sealing. Increased humidity leads to a decrease in the insulation level of the system. Adding humidity monitoring can maintain the insulation of the system. Currently, household products on the market mainly protect against the impact of temperature on battery cells. In extreme weather conditions such as heavy rain, product safety is affected. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to solve the problem in the prior art that energy storage batteries cannot be actively protected based on environmental humidity, thereby providing a protection circuit and a battery.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] In a first aspect, the utility model provides a protection circuit, which is arranged inside a battery. The protection circuit includes: a temperature and humidity sensor, a collection unit and a control unit, wherein the temperature and humidity sensor, whose input end collects the humidity in the battery, and whose output end is connected to the first input end of the collection unit, is used to generate a corresponding humidity voltage signal according to the collected humidity, and then output the humidity voltage signal and its own temperature information; the collection unit, whose second input end is connected to the battery cell of the battery, whose communication end is connected to the communication end of the control unit, and whose control end is connected to the output end of the control unit, determines whether the humidity voltage signal is valid by comparing its own temperature with the temperature information sent by the temperature and humidity sensor, and then outputs a corresponding control signal by comparing the humidity voltage signal with the humidity voltage threshold; the control unit, whose output end serves as the output end of the battery; when the collection unit determines that the first humidity voltage signal is valid, and the humidity voltage signal is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, the collection unit outputs a first control signal, so that the control unit performs a humidity alarm; when the collection unit determines that the second humidity voltage signal is valid, and the humidity voltage signal is greater than or equal to the second humidity voltage threshold, the collection unit outputs a second control signal, so that the control unit turns off the output of the battery; the first humidity voltage threshold is less than the second humidity voltage threshold.

[0006] The utility model provides a protection circuit in which the temperature and humidity sensor outputs humidity voltage signals of different levels according to the different humidity in the battery, so that the acquisition unit determines the humidity in the battery according to the humidity voltage signal and outputs a corresponding control signal to the control unit. The control unit performs an alarm or shuts down the battery output based on the different control signals, so that when the insulation level in the battery is reduced due to excessive humidity, the battery output circuit is cut off in time to avoid leakage and other situations that endanger personal safety, thereby improving the safety of the battery; the acquisition unit also determines whether the humidity voltage signal output by the temperature and humidity sensor is correct and effective by comparing its own temperature with the temperature of the temperature and humidity sensor, and then outputs a control signal, thereby improving the reliability of the protection circuit and avoiding false triggering of the protection action to affect the normal operation of the battery output circuit.

[0007] In an optional embodiment, the temperature and humidity sensor includes: a humidity acquisition unit and a temperature acquisition unit, wherein the humidity acquisition unit, whose input end acquires the humidity in the battery, and whose output end is connected to the first input end of the acquisition unit, is used to output a corresponding humidity voltage signal according to the collected humidity; the temperature acquisition unit, which is connected to the first input end of the acquisition unit, is used to convert its own temperature information into a temperature voltage signal and send it to the acquisition unit.

[0008] The protection circuit provided by the utility model is that the humidity acquisition unit can output different humidity voltage signals according to different humidity, and the temperature acquisition unit can send its own temperature information to the acquisition unit, so that the acquisition unit can judge whether the working state of the humidity acquisition unit is normal according to the temperature information, thereby judging whether the humidity voltage signal is correct and effective, thereby ensuring the accuracy and reliability of the control signal output by the acquisition unit.

[0009] In an optional embodiment, the collection unit includes: a humidity judgment unit, a temperature judgment unit and an output unit, wherein the humidity judgment unit has an input end connected to the output end of the humidity collection unit, and an output end connected to the first input end of the output unit. When the humidity voltage signal is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, the humidity judgment unit outputs a first comparison result; when the humidity voltage signal is greater than or equal to the second humidity voltage threshold, the humidity judgment unit outputs a second comparison result; the temperature judgment unit has a first input end connected to the temperature collection unit, a second input end collects temperature data of the collection unit, and an output end connected to the output unit. The second input end of the control unit is connected, which is used to obtain the temperature data of the temperature and humidity sensor based on the temperature voltage signal, and compare the temperature data of the temperature and humidity sensor with the temperature data of the acquisition unit, and output the determination result when it determines that the temperature data are equal; the output unit, whose first output end is connected to the communication end of the control unit, and whose second output end is connected to the output end of the control unit; when the output unit receives the first comparison result and the determination result, the output unit outputs a first control signal to enable the control unit to issue a humidity alarm; when the output unit receives the second comparison result and the determination result, the output unit outputs a second control signal to enable the control unit to turn off the output of the battery.

[0010] In an optional embodiment, the humidity judgment unit includes: a humidity voltmeter, whose input end is connected to the output end of the humidity collection unit, and whose output end is connected to the first input end of the output unit. When the humidity voltage signal is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, the humidity voltmeter outputs a first comparison result; when the humidity voltage signal is greater than or equal to the second humidity voltage threshold, the humidity voltmeter outputs a second comparison result.

[0011] In an optional embodiment, the temperature judgment unit includes: a temperature voltmeter and a comparison unit, wherein the temperature voltmeter has an input end connected to the temperature acquisition unit, and an output end connected to the first input end of the comparison unit, and is used to display the temperature data of the temperature and humidity sensor based on the temperature voltage signal, and send the temperature data to the comparison unit; the comparison unit has a second input end that acquires the temperature data of the acquisition unit, and an output end connected to the second input end of the output unit, and is used to compare the temperature data of the temperature and humidity sensor and the temperature data of the acquisition unit, and output a determination result when it determines that the temperature data are equal.

[0012] In an optional embodiment, the acquisition unit also includes: a thermistor and a voltage measuring unit, wherein the thermistor is connected to the input end of the voltage measuring unit; the voltage measuring unit has an output end connected to the second input end of the comparison unit, and is used to output the temperature data of the thermistor after measuring the resistance value of the thermistor.

[0013] The protection circuit provided by the utility model obtains the temperature of the collection unit through the voltage of the thermistor, has a simple measuring method and low circuit cost.

[0014] In an optional embodiment, the acquisition unit further includes: a temperature sensor, whose input end acquires the temperature of the acquisition unit, and whose output end is connected to the second input end of the comparison unit, and is used to output temperature data of the acquisition unit based on the temperature of the acquisition unit.

[0015] In an optional embodiment, the collection unit also includes: a battery cell status collection unit, a first end of which is connected to the battery cell of the battery, and a second end of which is connected to the communication end of the control unit, which is used to collect the working status information of the battery cell and send the working status information of the battery cell to the control unit.

[0016] The protection circuit provided by the utility model can monitor the state of the battery cell in real time through the battery cell state acquisition unit.

[0017] In a second aspect, the utility model provides a battery, comprising a battery body and the protection circuit of the first aspect, wherein the protection circuit is arranged in the battery body; the second input end of the acquisition unit is connected to the battery cell in the battery body, and the output end of the control unit is connected to the output end of the battery body.

[0018] The battery provided by the utility model can give an alarm or automatically cut off the output circuit when the internal humidity is high, and will not perform a protective action when the temperature and humidity sensor fails. The battery has a high safety level and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A composition diagram of a specific example of a protection circuit according to an embodiment of the utility model;

[0021] Figure 2 A composition diagram of another specific example of a protection circuit according to an embodiment of the present utility model;

[0022] Figure 3 A composition diagram of another specific example of a protection circuit according to an embodiment of the present utility model;

[0023] Figure 4 A composition diagram of another specific example of a protection circuit according to an embodiment of the present utility model;

[0024] Figure 5 A composition diagram of another specific example of a protection circuit according to an embodiment of the present utility model;

[0025] Figure 6 A structural diagram of a specific circuit of the protection circuit of an embodiment of the utility model;

[0026] Figure 7 The figure is a composition diagram of a specific example of a battery according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] As the battery ages, the sealing of the battery decreases. In a humid environment such as dew and precipitation, moisture can easily enter the battery, causing the humidity inside the battery to increase, thereby causing a short circuit in the battery, damaging the battery or increasing the safety risk of the battery power supply. Therefore, in order to enhance the self-protection ability of the battery, this embodiment provides a protection circuit, such as Figure 1 As shown, the protection circuit is arranged inside the battery, and the protection circuit includes: a temperature and humidity sensor 1, a collection unit 2 and a control unit 3.

[0032] like Figure 1 As shown, the temperature and humidity sensor 1 has an input end for collecting the humidity in the battery, and an output end connected to the first input end of the collection unit 2. It is used to generate a corresponding humidity voltage signal according to the collected humidity, and then output the humidity voltage signal and its own temperature information.

[0033] Specifically, Figure 1 In order to avoid excessive humidity in the battery and reduce the power supply reliability of the battery, this embodiment uses a temperature and humidity sensor 1 to collect the humidity in the battery, and converts the collected humidity into a corresponding humidity voltage signal. The temperature and humidity sensor 1 then sends the humidity voltage signal and its own temperature information to the collection unit 2.

[0034] It should be noted that those skilled in the art can set the number and size of the humidity voltage thresholds according to the specific parameters of the battery and actual needs to achieve comprehensive monitoring of the humidity in the battery.

[0035] like Figure 1 As shown, the acquisition unit 2 has its second input terminal connected to the battery cell, its communication terminal connected to the communication terminal of the control unit 3, and its control terminal connected to the output terminal of the control unit 3. It determines whether the humidity voltage signal is valid by comparing its own temperature with the temperature information sent by the temperature and humidity sensor 1, and then outputs a corresponding control signal by comparing the humidity voltage signal with the humidity voltage threshold.

[0036] Specifically, Figure 1 When the acquisition unit 2 receives the humidity voltage signal, it compares its own temperature with the temperature information sent by the temperature and humidity sensor 1. Since the acquisition unit 2 and the temperature and humidity sensor 1 are both arranged on the same circuit board in the battery, the temperature of the two should be consistent when they are working normally.

[0037] Specifically, Figure 1When the acquisition unit 2 determines that its own temperature is consistent with the temperature of the temperature and humidity sensor 1, it indicates that the temperature and humidity sensor 1 is working normally, that is, the humidity voltage signal sent by the temperature and humidity sensor 1 is correct and valid, and the acquisition unit 2 compares the humidity voltage signal with the humidity voltage threshold and generates a corresponding control signal; when the acquisition unit 2 determines that its own temperature is inconsistent with the temperature of the temperature and humidity sensor 1, it indicates that the temperature and humidity sensor 1 is working abnormally, that is, the humidity voltage signal sent by the temperature and humidity sensor 1 is incorrect, and the acquisition unit 2 does not respond to the humidity voltage signal.

[0038] like Figure 1 As shown, the control unit 3 has an output terminal serving as an output terminal of the battery.

[0039] Figure 1 When the acquisition unit 2 determines that the first humidity voltage signal is valid and the humidity voltage signal is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, the acquisition unit 2 outputs a first control signal, so that the control unit 3 issues a humidity alarm.

[0040] Figure 1 In the embodiment, when the acquisition unit 2 determines that the second humidity voltage signal is valid and the humidity voltage signal is greater than or equal to the second humidity voltage threshold, the acquisition unit 2 outputs a second control signal, so that the control unit 3 turns off the output of the battery, and the first humidity voltage threshold is less than the second humidity voltage threshold.

[0041] Specifically, Figure 1 When the humidity in the battery is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, it indicates that the humidity in the battery is high at this time, but the humidity in the battery will not affect the normal operation of the battery. Therefore, it is only necessary to monitor the humidity in the battery and alarm. The staff can maintain the battery based on the alarm signal and the battery condition; when the humidity in the battery is greater than the second humidity voltage threshold, it indicates that the humidity in the battery is too high at this time. Excessive humidity causes the insulation level and safety level in the battery to decrease. If the battery continues to work at this humidity, there will be a higher safety risk. Short circuits are likely to occur inside the battery, resulting in reduced safety of external output. Therefore, the battery needs to automatically shut down the external output at the output end.

[0042] Specifically, Figure 1 When the control unit 3 receives the first control signal, the control unit 3 issues a humidity alarm, which facilitates the control unit 3 or the operator to determine whether to perform protection processing, such as shutting down the battery output in advance for power-off protection. When the control unit 3 receives the second control signal, the control unit 3 directly shuts down the battery output.

[0043] It should be noted that when the acquisition unit 2 determines that the temperature and humidity sensor 1 is working abnormally, it can control the control unit 3 to send an alarm signal of abnormal working state, so as to facilitate the staff to conduct troubleshooting.

[0044] It should be noted that this embodiment only improves the structure of the protection circuit and the connection method of the temperature and humidity sensor 1, the acquisition unit 2 and the control unit 3. The above-mentioned temperature and humidity sensor 1 generates a corresponding humidity voltage signal according to different humidity, and the acquisition unit 2 generates a corresponding control signal according to the temperature information and the humidity voltage signal. These are all existing technologies and will not be repeated here.

[0045] In the protection circuit provided by the present embodiment, the temperature and humidity sensor outputs humidity voltage signals of different levels according to the different humidity in the battery, so that the acquisition unit determines the humidity in the battery according to the humidity voltage signal and outputs a corresponding control signal to the control unit. The control unit issues an alarm or shuts down the battery output based on different control signals, so that when the insulation level in the battery is reduced due to excessive humidity, the battery output circuit is cut off in time to avoid leakage and other situations that endanger personal safety, thereby improving the safety of the battery; the acquisition unit also determines whether the humidity voltage signal output by the temperature and humidity sensor is correct and valid by comparing its own temperature with the temperature of the temperature and humidity sensor, and then outputs a control signal, thereby improving the reliability of the protection circuit and avoiding false triggering of the protection action that affects the normal operation of the battery output circuit.

[0046] In some optional embodiments, such as Figure 2 As shown, the temperature and humidity sensor 1 includes: a humidity acquisition unit 11 and a temperature acquisition unit 12, wherein the humidity acquisition unit 11 has an input end that acquires the humidity in the battery, and an output end that is connected to the first input end of the acquisition unit 2; the temperature acquisition unit 12 is connected to the first input end of the acquisition unit 2.

[0047] Specifically, Figure 2 In the embodiment, the humidity acquisition unit 11 is used to collect the humidity inside the battery of the temperature and humidity sensor 1 in real time and output the corresponding humidity voltage signal to the acquisition unit 2. The temperature acquisition unit 12 is used to convert its own temperature information into a temperature voltage signal and then send it to the acquisition unit 2.

[0048] In some optional embodiments, such as Figure 2 As shown, the collection unit 2 includes: a humidity judgment unit 21 , a temperature judgment unit 22 and an output unit 23 .

[0049] Figure 2 In the humidity judgment unit 21, its input end is connected to the output end of the humidity collection unit 11, and its output end is connected to the first input end of the output unit 23. When the humidity voltage signal is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, the humidity judgment unit 21 outputs a first comparison result; when the humidity voltage signal is greater than or equal to the second humidity voltage threshold, the humidity judgment unit 21 outputs a second comparison result.

[0050] Alternatively, if Figure 3 As shown, the humidity judgment unit 21 includes: a humidity voltmeter 211, whose input end is connected to the output end of the humidity acquisition unit 11, and whose output end is connected to the first input end of the output unit 23. When the humidity voltage signal is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, the humidity voltmeter 211 outputs a first comparison result; when the humidity voltage signal is greater than or equal to the second humidity voltage threshold, the humidity voltmeter 211 outputs a second comparison result.

[0051] Figure 2 In the figure, the temperature judgment unit 22 has a first input end connected to the temperature acquisition unit 12, a second input end thereof acquires the temperature data of the acquisition unit 2, and an output end thereof is connected to the second input end of the output unit 23. It is used to obtain the temperature data of the temperature and humidity sensor 1 based on the temperature voltage signal, and compare the temperature data of the temperature and humidity sensor 1 with the temperature data of the acquisition unit 2, and output the judgment result when it determines that the temperature data are equal.

[0052] Specifically, Figure 2 When the temperature judgment unit 22 determines that the temperature data of the temperature and humidity sensor 1 is different from the temperature data of the acquisition unit 2, it indicates that the temperature and humidity sensor 1 is faulty and the humidity voltage signal generated by it is inaccurate. At this time, the temperature judgment unit 22 does not send the judgment result to the output unit 23, so that the output unit 23 does not send any control signal to the control unit 3.

[0053] Figure 2 In the output unit 23, a first output end thereof is connected to the communication end of the control unit 3, and a second output end thereof is connected to the output end of the control unit 3.

[0054] Specifically, Figure 2 When the output unit 23 receives the first comparison result and the determination result, the output unit 23 outputs the first control signal, so that the control unit 3 issues a humidity alarm; when the output unit 23 receives the second comparison result and the determination result, the output unit 23 outputs the second control signal, so that the control unit 3 shuts down the battery output.

[0055] It should be noted that the method for determining whether the temperatures are consistent and the method for the output unit 23 to generate different control signals according to the humidity voltage signal and the determination result in this embodiment are both prior arts and will not be described in detail here.

[0056] Alternatively, if Figure 3As shown, the temperature judgment unit 22 includes: a temperature voltage meter 221 and a comparison unit 222, wherein the temperature voltage meter 221 has an input end connected to the temperature acquisition unit 12, and an output end connected to the first input end of the comparison unit 222; the comparison unit 222 has a second input end that collects temperature data of the acquisition unit 2, and an output end connected to the second input end of the output unit 23.

[0057] Specifically, Figure 3 In the figure, the temperature voltage meter 221 is used to display the temperature data of the temperature and humidity sensor 1 based on the temperature voltage signal, and send the temperature data to the comparison unit 222; the comparison unit 222 is used to compare the temperature data of the temperature and humidity sensor 1 and the temperature data of the acquisition unit 2, and output the judgment result when it determines that the temperature data are equal.

[0058] Alternatively, if Figure 3 As shown, the acquisition unit 2 further includes: a battery cell status acquisition unit 24 , a first end of which is connected to the battery cell of the battery, and a second end of which is connected to the communication end of the control unit 3 .

[0059] Specifically, Figure 3 In the embodiment, the battery cell status acquisition unit 24 is used to collect the working status information of the battery cell and send the working status information of the battery cell to the control unit 3, so that the operator can adjust the output state of the control unit 3 according to the working status of the battery cell, such as shutting down the output when the battery cell is overheated or the battery power is low.

[0060] Alternatively, if Figure 4 As shown, the acquisition unit 2 also includes: a thermistor 25 and a voltage measuring unit 26, wherein the thermistor 25 is connected to the input end of the voltage measuring unit 26; the voltage measuring unit 26, whose output end is connected to the second input end of the comparison unit 222, is used to output the temperature data of the thermistor after measuring the resistance value of the thermistor.

[0061] Optionally, other thermal elements whose voltage varies with temperature, such as a thermistor capacitor and a thermistor tube, may be used instead of the thermistor.

[0062] Specifically, Figure 4In the figure, the thermistor 25 is a board-mounted Negative Temperature Coefficient (NTC) resistor, whose resistance value changes with temperature, so the voltage across the thermistor 25 also changes with temperature. The thermistor 25 and the temperature and humidity sensor 1 are set on the same circuit board, so when the temperature and humidity sensor 1 works normally, the temperature of the temperature and humidity sensor 1 should be consistent with the temperature of the thermistor 25. The temperature data output by the temperature acquisition unit 12 is converted into a voltage signal by a temperature voltmeter 221 and then input into the comparison unit 222. At the same time, the voltage measurement unit 26 collects the voltage signal across the thermistor 25 and inputs it into the comparison unit 222. The comparison unit 222 determines whether the temperature of the temperature and humidity sensor 1 is consistent with the temperature of the thermistor 25 by comparing the size of the two voltage signals, thereby determining whether the humidity voltage signal of the temperature and humidity sensor 1 is accurate.

[0063] Alternatively, if Figure 5 As shown, the acquisition unit 2 also includes: a temperature sensor 27, whose input end acquires the temperature of the acquisition unit 2, and whose output end is connected to the second input end of the comparison unit 222, and is used to output temperature data of the acquisition unit 2 based on the temperature of the acquisition unit 2.

[0064] Specifically, Figure 5 In the circuit board, the temperature sensor 27 or other components that can convert temperature into electrical signals can also be used to detect the temperature of the circuit board. The temperature sensor 27 and the temperature and humidity sensor 1 are arranged on the same circuit board. Therefore, when the temperature and humidity sensor 1 works normally, the temperature of the temperature and humidity sensor 1 should be consistent with the temperature of the temperature sensor 27. After the temperature data output by the temperature acquisition unit 12 is converted into a voltage signal by the temperature voltmeter 221 and input into the comparison unit 222, the comparison unit 222 compares the voltage signal with the temperature data transmitted back by the comparison temperature sensor 27, thereby judging whether the humidity voltage signal of the temperature and humidity sensor 1 is accurate.

[0065] For example, Figure 6This is a specific circuit diagram of the protection circuit of this embodiment. The temperature and humidity sensor 1 outputs a voltage signal to the acquisition unit 2 according to the real-time temperature and humidity conditions. The acquisition unit 2 can be an analog front-end chip (Active FrontEnd, AFE) or other acquisition chips with the above functions. The acquisition unit 2 determines the current temperature and humidity conditions by obtaining the temperature and humidity voltage signal of the temperature and humidity sensor 1, and determines the validity of the temperature and humidity sensor 1 data by comparing the temperature data of the temperature and humidity sensor 1 with its own temperature data. When the data of the temperature and humidity sensor 1 is judged to be valid, when it is judged that the humidity voltage signal is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, or when it is judged that the humidity voltage signal is greater than or equal to the second humidity voltage threshold, the acquisition unit 2 uploads the relevant information to the control unit 3, so that the control unit 3 can alarm and determine whether it is necessary to do early protection processing, such as comparing the relevant information with other preset conditions, so as to determine whether it is necessary to shut down the MOS / relay drive pin in advance. This is the first protection method.

[0066] For example, Figure 6 In the example, if the acquisition unit 2 determines that the information is correct and the data changes rapidly, or the control unit 3 fails due to humidity, the NFAULT pin of the acquisition unit 2 can be used as an IO port to output high and low levels. When the control unit 3 does not respond to the humidity signal in time, the NFAULT pin outputs a low level and pulls down the pin of the MOS / relay drive switch to shut down the external output circuit. This solution serves as a second protection measure for the insulation level of the protection circuit to be reduced due to humidity.

[0067] For example, Figure 6 In the example, the control unit 3 is connected to the collection unit 2 via GPIO, and the humidity can be set as 85% as the alarm threshold, at which time the RH port output voltage is approximately equal to 0.77*VDD.

[0068] This embodiment provides a battery, such as Figure 7 As shown, it includes a battery body 4 and a protection circuit of the above embodiments and any optional implementation manner thereof, wherein the protection circuit is arranged in the battery body 4; the second input end of the acquisition unit 2 is connected to the battery cell in the battery body 4, and the output end of the control unit 3 is connected to the output end of the battery body 4.

[0069] Specifically, after the temperature and humidity sensor 1 converts the collected humidity information in the battery body 4 into a corresponding humidity voltage signal, the humidity voltage signal and its own temperature information are sent to the acquisition unit 2. The acquisition unit 2 determines whether the temperature and humidity sensor 1 is in a normal working state by comparing the temperature information sent by the temperature and humidity sensor 1 with the temperature of the battery body 4. When the temperature and humidity sensor 1 is in a normal working state, the acquisition unit 2 converts the humidity voltage signal into a corresponding control signal and sends it to the control unit 3, so that the control unit 3 issues a humidity alarm or controls the control unit 3 to actively close the external output end of the battery body 4, or directly closes the external output end of the battery body 4.

[0070] The battery provided in this embodiment can give an alarm or automatically cut off the output circuit when the internal humidity is high, and will not perform protection actions when the temperature and humidity sensor fails. The battery has a high safety level and high reliability.

[0071] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A protection circuit, characterized in that: The protection circuit is arranged inside the battery, and includes: a temperature and humidity sensor, a collection unit and a control unit, wherein: A temperature and humidity sensor, whose input end collects the temperature and humidity in the battery, and whose output end is connected to the first input end of the collection unit, and is used to generate a corresponding humidity voltage signal according to the collected humidity, and then output the humidity voltage signal and its own temperature information; A collection unit, wherein the second input terminal thereof is connected to the battery cell of the battery, the communication terminal thereof is connected to the communication terminal of the control unit, and the control terminal thereof is connected to the output terminal of the control unit. After comparing its own temperature with the temperature information sent by the temperature and humidity sensor to determine whether the humidity voltage signal is valid, the collection unit outputs a corresponding control signal by comparing the humidity voltage signal with the humidity voltage threshold; A control unit, whose output terminal serves as an output terminal of the battery; When the acquisition unit determines that the humidity voltage signal is valid, and the humidity voltage signal is greater than a first humidity voltage threshold and less than a second humidity voltage threshold, the acquisition unit outputs a first control signal so that the control unit issues a humidity alarm; When the acquisition unit determines that the humidity voltage signal is valid and the humidity voltage signal is greater than or equal to a second humidity voltage threshold, the acquisition unit outputs a second control signal so that the control unit turns off the output of the battery; The first humidity voltage threshold is less than the second humidity voltage threshold.

2. The protection circuit according to claim 1, characterized in that: The temperature and humidity sensor includes: a humidity acquisition unit and a temperature acquisition unit, wherein: A humidity collection unit, whose input end collects the humidity in the battery, and whose output end is connected to the first input end of the collection unit, and is used to output a corresponding humidity voltage signal according to the collected humidity; The temperature acquisition unit is connected to the first input end of the acquisition unit and is used to convert its own temperature information into a temperature voltage signal and send it to the acquisition unit.

3. The protection circuit according to claim 2, characterized in that: The collection unit includes: a humidity judgment unit, a temperature judgment unit and an output unit, wherein: A humidity judgment unit, whose input end is connected to the output end of the humidity acquisition unit, and whose output end is connected to the first input end of the output unit, when the humidity voltage signal is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, the humidity judgment unit outputs a first comparison result; when the humidity voltage signal is greater than or equal to the second humidity voltage threshold, the humidity judgment unit outputs a second comparison result; a temperature judgment unit, whose first input end is connected to the temperature acquisition unit, whose second input end acquires the temperature data of the acquisition unit, and whose output end is connected to the second input end of the output unit, and which is used to obtain the temperature data of the temperature and humidity sensor based on the temperature voltage signal, and compare the temperature data of the temperature and humidity sensor with the temperature data of the acquisition unit, and output a judgment result when it is determined that the temperature data are equal; an output unit, wherein a first output end thereof is connected to a communication end of the control unit, and a second output end thereof is connected to an output end of the control unit; when the output unit receives the first comparison result and the determination result, the output unit outputs a first control signal so that the control unit performs a humidity alarm; When the output unit receives the second comparison result and the determination result, the output unit outputs a second control signal to enable the control unit to turn off the output of the battery.

4. The protection circuit according to claim 3, characterized in that: The humidity judgment unit comprises: A humidity voltmeter, whose input end is connected to the output end of the humidity acquisition unit, and whose output end is connected to the first input end of the output unit. When the humidity voltage signal is greater than the first humidity voltage threshold and less than the second humidity voltage threshold, the humidity voltmeter outputs a first comparison result; when the humidity voltage signal is greater than or equal to the second humidity voltage threshold, the humidity voltmeter outputs a second comparison result.

5. The protection circuit according to claim 3, characterized in that: The temperature judgment unit includes: a temperature voltage meter and a comparison unit, wherein: A temperature voltage meter, whose input end is connected to the temperature acquisition unit, and whose output end is connected to the first input end of the comparison unit, and which is used to display the temperature data of the temperature and humidity sensor based on the temperature voltage signal, and send the temperature data to the comparison unit; A comparison unit, whose second input end collects the temperature data of the collection unit, and whose output end is connected to the second input end of the output unit, is used to compare the temperature data of the temperature and humidity sensor and the temperature data of the collection unit, and outputs a determination result when it determines that the temperature data are equal.

6. The protection circuit according to claim 5, characterized in that: The acquisition unit also includes: a thermistor and a voltage measurement unit, wherein: a thermistor connected to an input terminal of the voltage measuring unit; The voltage measuring unit has an output end connected to the second input end of the comparison unit and is used to output temperature data of the thermistor after measuring the resistance value of the thermistor.

7. The protection circuit according to claim 5, characterized in that: The acquisition unit also includes: The temperature sensor has an input end for collecting the temperature of the collection unit and an output end connected to the second input end of the comparison unit, and is used to output the temperature data of the collection unit based on the temperature of the collection unit.

8. The protection circuit according to claim 1, characterized in that: The acquisition unit also includes: A cell status acquisition unit, whose first end is connected to the cell of the battery and whose second end is connected to the communication end of the control unit, is used to collect the working status information of the cell and send the working status information of the cell to the control unit.

9. A battery, characterized in that: It comprises a battery body and a protection circuit as claimed in any one of claims 1 to 8, wherein: The protection circuit is arranged in the battery body; The second input end of the acquisition unit is connected to the battery cell in the battery body, and the output end of the control unit is connected to the output end of the battery body.

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